You opt to follow the trail forward, if only because you might be caught off guard if it turns out to be shorter than you expect. If someone is still nearby, best to work that out as soon as possible.
“What, where are we going now?” the priest asks as you turn back towards the door.
“Someone was here. I’m trying to work out where they are now.”
“Fine. You do that, I’m staying right here. I’m getting tired of being led around while everybody circles the stone instead of saying what they want.”
Hmm. It probably works better for your tracking if you don’t have to keep an eye on him, but on the other hand, you’re not sure how good of an idea it is to leave him alone. Reth guided you to him for a reason, after all, and he’s got that object from Qlat now too. What if his captors find him here, and take it from him?
Then again, the trail might be a short one and you could return quickly. And it’s going to be troublesome to convince him to come along if you don’t have a particular reason for wanting him with you.
You take a moment to consider what to do with him before you continue on the trail.
Feed the slicer beetle to the talking lizard and tell it to come find you quickly if anybody else shows up, then leave the priest and the lizard behind while you investigate.
Let him stay behind, you won’t be long